Normalize line endings in resource stream content to LF

Replace the buffer-copy approach with BufferedReader.readLine(), which
strips CR/LF and reassembles lines with LF only - the same pattern all
other resource loaders in the codebase already use. This also removes
the now-unused copy() utility method.

Author: travkin79

flexmark-ext-admonition/src/main/java/com/vladsch/flexmark/ext/admonition/AdmonitionExtension.java

@@ -148,11 +148,13 @@ public static Map<String, String> getQualifierSvgValueMap() {
 
     public static String getInputStreamContent(InputStream inputStream) {
         try {
-            InputStreamReader streamReader = new InputStreamReader(inputStream, StandardCharsets.UTF_8);
-            StringWriter stringWriter = new StringWriter();
-            copy(streamReader, stringWriter);
-            stringWriter.close();
-            return stringWriter.toString();
+            BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, StandardCharsets.UTF_8));
+            StringBuilder sb = new StringBuilder();
+            String line;
+            while ((line = reader.readLine()) != null) {
+                sb.append(line).append('\n');
+            }
+            return sb.toString();
         } catch (Exception e) {
             e.printStackTrace();
             return "";
@@ -167,16 +169,6 @@ public static String getDefaultScript() {
         return getInputStreamContent(AdmonitionExtension.class.getResourceAsStream("/admonition.js"));
     }
 
-    public static void copy(Reader reader, Writer writer) throws IOException {
-        char[] buffer = new char[4096];
-        int n;
-        while (-1 != (n = reader.read(buffer))) {
-            writer.write(buffer, 0, n);
-        }
-        writer.flush();
-        reader.close();
-    }
-
     private AdmonitionExtension() {
     }